基于有限元分析的曲线刚构桥弹性稳定性研究

Elastic Stability of Curve Rigid Frame Bridge Based on Finite Element Analysis

在综合分析国内外曲线刚构桥发展现状、结构优势以及受力特点的基础上,以某预应力混凝土曲线连续刚构桥工程实例为依托,运用Midas/Civil2012有限元软件,对该桥在悬臂施工状态及成桥运营状态不同荷载工况下的弹性稳定性进行了研究。研究结果表明:在施工悬臂状态下高墩较低墩容易失稳;在成桥运营阶段全桥满载工况稳定系数最小;桥梁平曲线半径对施工悬臂状态下高墩稳定系数影响较为明显,且稳定系数随着半径的增大而增大。

Based on the comprehensive analysis on the curve rigid frame bridge′s domestic and interna-tional development status, structural superiority and mechanical characteristics, and taking a curved pre-stressed concrete continuous rigid frame bridge as an examples, the elastic stability of the bridge under different loading conditions in cantilever construction status and operational status are analyzed by using Midas/Civil 2012 finite element software. The research results show that：it′s easier for higher pier to lose stability than lower pier in cantilever construction status;the stability factor gets its minimum in the opera-tional phase with full load;the influence of the radius of horizontal curve of bridge on the stability factor of high pier in cantilever construction status is relatively obvious, and the stability factor increases as the ra-dius increases.